Their take on the Brandy and Monica classic.

HAIM embarked on a U.S. tour with support from Lizzo this week, and footage from their second show reveals that things are off to a great start. Performing in Seattle, the band of sisters were joined by Lizzo for a rendition of "The Boy Is Mine," here called "The Girl Is Mine."

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"Lizzo is brandy, este is monica 🤗" the band wrote in a Tweet sharing video of the cover. Watch above.

Last week, Lizzo released "Fitness," a "Declaration of Independence from the bullshit," complete with a fully inspiring music video. Her tour dates will HAIM, who'll play Coachella along the way, will continue through May.